Date: Fri, 22 Jan 2016 15:00:38 -0800 From: Kees Cook <keescook@...omium.org> To: Robert Święcki <robert@...ecki.net>, "Serge E. Hallyn" <serge.hallyn@...ntu.com>, Ben Hutchings <ben@...adent.org.uk> Cc: Andrew Morton <akpm@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, Richard Weinberger <richard@....at>, "Eric W. Biederman" <ebiederm@...ssion.com>, Andy Lutomirski <luto@...capital.net>, Dmitry Vyukov <dvyukov@...gle.com>, David Howells <dhowells@...hat.com>, Kostya Serebryany <kcc@...gle.com>, Alexander Potapenko <glider@...gle.com>, Eric Dumazet <edumazet@...gle.com>, Sasha Levin <sasha.levin@...cle.com>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH 2/2] sysctl: allow CLONE_NEWUSER to be disabled On Fri, Jan 22, 2016 at 2:55 PM, Robert Święcki <robert@...ecki.net> wrote: > 2016-01-22 23:50 GMT+01:00 Kees Cook <keescook@...omium.org>: > >>> Seems that Debian and some older Ubuntu versions are already using >>> >>> $ sysctl -a | grep usern >>> kernel.unprivileged_userns_clone = 0 >>> >>> Shall we be consistent wit it? >> >> Oh! I didn't see that on systems I checked. On which version did you find that? > > $ uname -a > Linux bc1 4.3.0-0.bpo.1-amd64 #1 SMP Debian 4.3.3-5~bpo8+1 > (2016-01-07) x86_64 GNU/Linux > $ cat /etc/debian_version > 8.2 Ah-ha, Debian only, though it looks like this was just committed to the Ubuntu kernel tree too: > IIRC some older kernels delivered with Ubuntu Precise were also using > it (but maybe I'm mistaken) I don't see it there. I think my patch is more complete, but I'm happy to change the name if this sysctl has already started to enter the global consciousness. ;) Serge, Ben, what do you think? -Kees -- Kees Cook Chrome OS & Brillo Security
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